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So, this is a new bike with 7-speed freewheel instead of freehub and cassette? Freewheels and anything 7-speed have been obsolete for about 25 years, certainly far before 29" bikes appeared. If you have a new bike with such components, it is likely to be extreme low end quality. With the new freewheel, it is also possible that the chain is already worn out ...


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I'm betting that you need to install a brand new chain and a brand new freewheel / cassette, at the same time, and out of an abundance of caution, make sure they're the same brand. I doubt your friend actually ruined anything, the more likely scenario is that the chain is old and stretched, causing it to slip ( or it's the wrong length as Daniel mentioned ). ...



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